Removing cloud library and terraform library (#2411)

Summary:
Pull Request resolved: #2411

# Context

This diff stack aims to delete the deployment library which was initially developed to delete the deployment shell scripts with python scripts for better code coverage.

This diff removes the cloud library and terraform library from the PCE deployment library. The cloud library contains code for interacting with AWS and GCP, while the terraform library contains code for deploying infrastructure using Terraform. The changes include deleting files and removing code from the cloud library and terraform library.

Reviewed By: ajaybhargavb

Differential Revision: D59231742

fbshipit-source-id: d3d432b0e4fd8f7a9fafd6a058b4e6c22be72108

Author: Ankush Singh